U.S. patent application number 15/712950 was filed with the patent office on 2018-01-11 for power supply system.
This patent application is currently assigned to OLYMPUS CORPORATION. The applicant listed for this patent is OLYMPUS CORPORATION. Invention is credited to Takehide FUJIMOTO, Yutaka FUJISAWA, Hideki KATO, Hitoshi KOMINE, Sadaaki TOMURA, Nanako UBAYAMA.
Application Number | 20180008124 15/712950 |
Document ID | / |
Family ID | 57584909 |
Filed Date | 2018-01-11 |
United States Patent
Application |
20180008124 |
Kind Code |
A1 |
FUJIMOTO; Takehide ; et
al. |
January 11, 2018 |
POWER SUPPLY SYSTEM
Abstract
An endoscope power supply system includes an endoscope including
an imaging unit that images an object, a housing apparatus to which
the endoscope is detachably connected, a plurality of power source
units that are provided in the housing apparatus and configured to
output electric power different from one another, switches each
provided in an output stage of each of the power source units of
the housing apparatus and formed of two FETs that are back-to-back
connected, and a controller that is provided in the housing
apparatus, selects a power source unit necessary to operate the
endoscope from the power source units, and controls the switches to
output electric power generated by the selected power source unit
to the endoscope
Inventors: |
FUJIMOTO; Takehide;
(Nishitama-gun, JP) ; UBAYAMA; Nanako;
(Hachioji-shi, JP) ; KOMINE; Hitoshi;
(Hachioji-shi, JP) ; FUJISAWA; Yutaka;
(Akishima-shi, JP) ; KATO; Hideki; (Kokubunji-shi,
JP) ; TOMURA; Sadaaki; (Kawaguchi-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
OLYMPUS CORPORATION |
Tokyo |
|
JP |
|
|
Assignee: |
OLYMPUS CORPORATION
Tokyo
JP
|
Family ID: |
57584909 |
Appl. No.: |
15/712950 |
Filed: |
September 22, 2017 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
PCT/JP2016/068716 |
Jun 23, 2016 |
|
|
|
15712950 |
|
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61B 1/00059 20130101;
A61B 1/05 20130101; G02B 23/2484 20130101; A61B 1/00027 20130101;
G02B 23/2407 20130101 |
International
Class: |
A61B 1/00 20060101
A61B001/00; A61B 1/05 20060101 A61B001/05; G02B 23/24 20060101
G02B023/24 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 26, 2015 |
JP |
2015-128547 |
Claims
1-8. (canceled)
9. An endoscope system comprising: an endoscope including an
imaging unit that images an object, and a cable; a housing
apparatus detachably connected to the endoscope via the cable; a
plurality of power source units that are provided in the housing
apparatus and configured to output electric power different from
one another; a plurality of switches, each provided in an output
stage of each of the power source units of the housing apparatus
and formed of a back-to-back connection in which same terminals of
the two FETs are connected; a common power supply line that makes
electric power output through the switches in common in the housing
apparatus, and supplies the common output to the endoscope from the
housing apparatus; a determination unit that is provided in the
endoscope, and determines whether or not the electric power
supplied through the common power supply line is appropriate
electric power to operate the endoscope; a communication line
through which the endoscope requests the housing apparatus to
output appropriate electric power, when the determination unit
determines that the electric power supplied through the common
power supply line is not appropriate electric power to operate the
endoscope; and a controller that is provided in the housing
apparatus, selects a power source unit from the power source units
in accordance with a request for appropriate electric power input
through the communication line, and controls the switches to output
electric power generated by the selected power source unit to the
endoscope.
10. The endoscope system according to claim 9, further comprising
an information memory that is provided in the endoscope and stores
information specific to a type of the endoscope, wherein the
controller selects the power source unit that is necessary to
output electric power necessary to operate the endoscope from the
power source units in accordance with the information specific to
the type.
11. The endoscope system according to claim 10, wherein the
information memory stores information indicative of a type of an
imaging element that forms the imaging unit provided in the
endoscope.
12. The endoscope system according to claim 9, wherein the
endoscope further includes a resistor having a resistance value
that is specific to a type of the endoscope; and wherein the
housing apparatus reads the resistance value of the resistor, and
selects the power source unit that is necessary to output electric
power necessary to operate the endoscope from the power source
units in accordance with the read resistance value.
13. The endoscope system according to claim 12, wherein the
resistor has a resistance value corresponding to a type of an
imaging element that forms the imaging unit provided in the
endoscope.
14. The endoscope system according to claim 9, wherein each of the
power source units is a variable regulator.
15. The endoscope system according to claim 9, wherein each of the
power source units is an LDO regulator.
16. The endoscope system according to claim 9, wherein the
determination unit takes in a voltage supplied through the common
power supply line, compares the voltage with a prestored
appropriate voltage value, and requests an output of appropriate
electric power through the communication line, if a difference
between the taken in voltage and the appropriate voltage value
exceeds a predetermined value.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation Application of PCT
Application No. PCT/JP2016/068716, filed Jun. 23, 2016 and based
upon and claiming the benefit of priority from the prior Japanese
Patent Application No, 2015-128547, filed Jun. 26, 2015, the entire
contents of both of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0002] The present invention relates to an endoscope power supply
system.
2. Description of the Related Art
[0003] An endoscope system includes an endoscope and a housing
apparatus to which the endoscope is attached. An endoscope in
recent years incorporates various electronic elements corresponding
to intended uses. The electronic elements incorporated in the
endoscope are operated upon receipt of power supplied from the
housing apparatus. In endoscope power supply systems proposed in
recent years, a magnitude of electric power output from a power
source unit of the housing apparatus is variable, so that the
system can cope with reduction in voltage due to aging degradation
in the endoscope or can be adapted to various types of endoscope in
accordance with intended uses. For example, Jpn. Pat. Appln. KOKAI
Publication No, 2010-66409 discloses an endoscope apparatus in
which a magnitude of electric power supplied to an endoscope is
determined in accordance with an ID of an insertion section and an
ID of a cable of the endoscope.
BRIEF SUMMARY OF THE INVENTION
[0004] An endoscope power supply system according to an aspect of
the invention comprises: an endoscope including an imaging unit
that images an object; a housing apparatus to which the endoscope
is detachably connected; a plurality of power source units that are
provided in the housing apparatus and configured to output electric
power different from one another; switches, each provided in an
output stage of each of the power source units of the housing
apparatus and formed of two FETs that are back-to-back connected;
and a controller that is provided in the housing apparatus, selects
a power source unit necessary to operate the endoscope the power
source units, and controls the switches to output electric power
generated by the selected power source unit to the endoscope.
[0005] Advantages of the invention will be set forth in the
description which follows, and in part will be obvious from the
description, or may be learned by practice of the invention. The
advantages of the invention may be realized and obtained by means
of the instrumentalities and combinations particularly pointed out
hereinafter.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0006] The accompanying drawings, which are incorporated in and
constitute a part of the specification, illustrate embodiments of
the invention, and together with the general description given
above and the detailed description of the embodiments given below,
serve to explain the principles of the invention.
[0007] FIG. 1 is a block diagram showing a configuration of an
endoscope power supply system according to a first embodiment of
the present invention.
[0008] FIG. 2 is a diagram showing a configuration relating to
power output to an endoscope in a power supply unit of the first
embodiment.
[0009] FIG. 3 is a block diagram showing a configuration of an
endoscope power supply system according to a second embodiment of
the present invention.
[0010] FIG. 4 is a diagram showing a configuration relating to
power output to an endoscope in a power supply unit of the second
embodiment .
DETAILED DESCRIPTION OF THE INVENTION
[0011] Embodiments of the present invention will be described with
reference to the accompanying drawings.
First Embodiment
[0012] The first embodiment of the present invention is explained
below. FIG. 1 is a block diagram showing a configuration of an
endoscope power supply system according to a first embodiment of
the present invention. The endoscope power supply system 1 includes
an endoscope 2 and a housing apparatus 3. The endoscope 2 includes
an imaging unit to observe an inside of a subject body, which is an
object to be imaged. The housing apparatus 3 outputs power to
actuate electronic elements incorporated in the endoscope 2. In the
following, blocks in the endoscope power supply system 1 will be
explained.
[0013] The endoscope 2 includes an insertion section 21 and a cable
22. The insertion section 21 is a scope portion of the endoscope 2
and is inserted in the subject body. An objective lens 211 and an
imaging element 212 are provided at a distal end of the insertion
section 21. The objective lens 211 is an optical system to form an
image received from the object on the imaging element 212. The
imaging element 212, which constitutes the imaging unit together
with the objective lens 211, is one of the electronic elements
incorporated in the endoscope 2. The imaging element 212 includes
pixels arranged two dimensionally. Each of the pixels is, for
example, a photodiode, and generates an electric signal (image
signal) corresponding to the amount of light input through the
objective lens 211.
[0014] The endoscope 2 also includes an ID memory 213. The ID
memory 213 is, for example, a flash memory, and stores ID
information indicative of a type of the endoscope 2.
[0015] The cable 22 is connected to the housing apparatus 3 via a
connector (not shown). In the cable 22, a power supply line 222a,
an output signal line 222b, and a communication line 222c are
contained. The power supply line 222a is connected to the imaging
element 212, and is configured to be connected to a power supply
unit 32 of the housing apparatus 3, when the insertion section 21
is connected to the housing apparatus 3 via the connector (not
shown) . The power supply line 222a is a signal line to supply
electric power generated in the housing apparatus 3 to the imaging
element 212. The output signal line 222b is connected to the
imaging element 212, and is configured to be connected to a signal
processor 31 of the housing apparatus 3, when the insertion section
21 is connected to the housing apparatus 3 via the connector (not
shown). The output signal line 222b is a signal line to transmit an
image signal generated in the imaging element 212 to the signal
processor 31. The communication line 222c is connected to the ID
memory 213, and is configured to be connected to a controller 33 of
the housing apparatus 3, when the insertion section 21 is connected
to the housing apparatus 3 via the connector (not shown) . The
communication line 222c is a signal line to communicate information
such as the ID information.
[0016] The housing apparatus 3 is configured so as to detachably
connect the endoscope 2, and executes processing such as control of
the endoscope 2. For example, the housing apparatus 3 is a video
processor that processes an image signal generated by the endoscope
2. In this case, the housing apparatus 3 includes the signal
processor 31, the power supply unit 32, and the controller 33.
Outside the housing apparatus 3, an operation unit 34 is provided.
The housing apparatus 3 is connected to a monitor 35.
[0017] The signal processor 31 executes various types of signal
processing for the image signal from the imaging element 212. For
example, the signal processor 31 executes signal processing to
correct luminance characteristics and chromatic characteristics of
the image signal to be adapted to a display in the monitor 35.
[0018] The power supply unit 32 outputs power to actuate electronic
elements incorporated in the housing apparatus 3 and electronic
elements incorporated in the endoscope 2. Details of the power
supply unit 32 are described later.
[0019] The controller 33 is formed of, for example, an FPGA (Field
Programmable Gate Array) and controls operations of the housing
apparatus 3. The controller 33 also reads the ID information of the
endoscope 2 from the ID memory 213 of the endoscope 2, and performs
a control specific to the endoscope 2 in accordance with the read
ID information. The control includes power management of the
endoscope 2.
[0020] The operation unit 34 includes an operation member to allow
a user to operate the housing apparatus 3 The operation member may
be of a type such as a button or a switch, or a type such as a
touch panel. When the operation member of the operation unit 34 is
operated, the controller 33 controls various types of processing in
accordance with the operation of the operation unit 34.
[0021] The monitor 35 is, for example, a liquid crystal display.
The monitor 35 displays an image and the like generated as a result
of signal processing by the signal processor 31 under the control
of the controller 33.
[0022] The power supply unit 32 is explained below. FIG. 2 is a
diagram showing a configuration relating to power output to the
endoscope 2 in the power supply unit 32 of the first embodiment.
The power supply unit 32 includes a plurality of LDO regulators
(Low Dropout regulators), which are power source units. In the
example shown in FIG. 2, the power supply unit 32 includes four LDO
regulators 321, 322, 323, and 324.
[0023] Each of the LDO regulators of this embodiment is a fixed
voltage output LDO regulator, which outputs a predetermined fixed
voltage. The LDO regulator 321 converts an input voltage to a
voltage V1 and outputs the voltage V1. A current output from the
LDO regulator 321 is I1. The LDO regulator 322 converts an input
voltage to a voltage V2 and outputs the voltage V2. A current
output from the LDO regulator 322 is I2. The LDO regulator 323
converts an input voltage to a voltage V3 and outputs the voltage
V3. A current output from the LDO regulator 323 is I3. The LDO
regulator 324 converts an input voltage to a voltage V4 and outputs
the voltage V4. A current output from the LDO regulator 324 is I4.
The values of the voltages V1, V2, V3, and V4 are different from
one another. The values of the currents I1, I2, I3, and I4 may be
different or the same.
[0024] An output stage of the LDO regulator 321 is connected to a
switch including two FETs, namely FET Tr11 and FET Tr12, which are
back-to-back connected. Back-to-back connection is a connection
structure in which the same terminals of the two FETs are
connected. For example, a drain of the FET Tr11 is connected to the
output stage of the LDO regulator 321, and a source of the FET Tr11
is connected to a source of the FET Tr 12. drain of the FET Tr12 is
connected to an output terminal O of the power supply unit 32.
Furthermore, gates of the FET Tr11 and the FET Tr12 are connected
to the controller 33. In the back-to-back connection described
above, the directions of body diodes of the FET Tr11 and the FET
Tr12 are opposite to each other.
[0025] Similarly, an output stage of the LDO regulator 322 is
connected to two FETs, namely FET Tr21 and FET Tr22, which are
back-to-back connected, and an output stage of the LDO regulator
323 is connected to two FETs, namely FET Tr31 and FET Tr32, which
are back-to-back connected. An output stage of the LDO regulator
324 is connected to two FETs, namely FET Tr41 and FET Tr42, which
are back-to-back connected. The connection structure of each of the
pair of the FET Tr21 and the FET Tr22, the pair of the FET Tr31 and
the FET Tr32, and the pair of the FET Tr41 and the FET Tr42 is the
same as that of the pair of the FET Tr11 and the FET Tr12.
[0026] Operations of the endoscope power supply system 1 of this
embodiment will be explained. For example, when the user turns on
the power source of the operation unit 34 of the housing apparatus
3, the endoscope power supply system 1 starts operating. When the
housing apparatus 3 is powered on, the controller 33 reads the ID
information of the endoscope 2 from the ID memory 213 through the
communication line 222c . The controller 33 determines the type of
the endoscope 2 from the read ID information, and controls switches
in accordance with the type.
[0027] In this embodiment, depending on the type of the endoscope
2, the endoscope 2 is associated with the LDO regulator that is
necessary to operate the endoscope 2. The controller 3 controls the
switches in accordance with the association. For example, if the
controller 33 determines that the LDO regulator necessary to
operate the endoscope 2 is the LDO regulator 321 in view of the
type of the endoscope 2 determined from the ID information, the
controller 33 applies a gate-on voltage to the gates of the FET
Tr11 and the FET Tr12. As a result, the voltage V1 and the current
I1 (power P1) generated by the LDO regulator 321 are output to the
endoscope 2 through the power supply line 222a. The electronic
element, for example, the imaging element 212, of the endoscope 2
is actuated by the power P1.
[0028] In the example described above, one LDO regulator is
selected for one endoscope 2. However, the embodiment may be
configured so that two or more LDO regulators are selected for one
endoscope 2. For example, if the controller 33 determines that the
LDO regulators necessary to operate the endoscope 2 are the LDO
regulator 321 and the LDO regulator 322 in view of the type of the
endoscope 2 determined from the ID information, the controller 33
applies a gate-on voltage to the gates of the FET Tr11 and the FET
Tr12 and the gates of the FET Tr21 and the FET Tr22.
[0029] The imaging element 212 images an inside of the subject body
and generates an image signal concerning the subject body. The
image signal generated by the imaging element 212 is input o the
signal processor 31 of the housing apparatus 3 through the output
signal line 222b. The signal processor 31 executes signal
processing for the image signal. Thereafter, the controller 33
inputs to the monitor 35 an image generated as a result of the
signal processing of the signal processor 31, and causes the
monitor 35 to start displaying the image.
[0030] Accordingly, the image inside the subject body is displayed
on the monitor 35.
[0031] As described above, according to this embodiment, the power
supply unit 32 of the housing apparatus 3 includes a plurality of
power supply units respectively associated with the types of the
endoscope 2, not a single power supply unit. Accordingly, the
housing apparatus 3 can output power suitable for the respective
types of the endoscope 2 that need different magnitudes of power to
actuate. Furthermore, since the power source units are provided for
the respective types of the endoscope 2, a power source unit for a
variable voltage output is not required. Therefore, the difference
between an input voltage and an output voltage in the power source
unit can be small, so that needless heat generation can be
suppressed.
[0032] Besides, in this embodiment, two FETs which are back-to-back
connected are used to switch between outputs of the power source
units. FETs are inexpensive as compared to relays. In a switch
using a single FET, when a current flows through the FET, the
current also flows to another power source unit through a body
diode of another FET. In contrast, the present embodiment uses a
switch formed of two FETs which are back-to-back connected. Because
of the use of two back-to-back connected FETs, a backward current
cannot flow to another power source unit, unlike in the case of
using a single FET.
[0033] Furthermore, since a flow of a backward current is
prevented, outputs from a plurality of power source units can pass
through one power supply line 222a in common.
[0034] In the embodiment described above, the type of the endoscope
2 can be determined by reading of the ID information from the ID
memory 213. However, the method of determination by the endoscope 2
is not limited to reading of the ID information. For example, the
endoscope 2 may include a resistor having a resistance value that
is specific to the type of the endoscope, and the housing apparatus
3 may be configured to read the resistance value. With this
configuration, the type of the endoscope 2 can be determined by
reading the resistance value instead of reading the ID information
from the ID memory 213.
[0035] Furthermore, in this embodiment, since it is only necessary
to discriminate the type of the imaging element to which power is
supplied, the ID information stored in the ID memory 213 may be
information indicative of only the type of the imaging element
provided in the endoscope 2. Alternatively, in the case of reading
the resistance value as described above, the resistance value may
be information indicative of only the type of the imaging
element.
Second Embodiment
[0036] The second embodiment of the present invention is explained
below. FIG. 3 is a block diagram showing a configuration of an
endoscope power supply system according to the second embodiment of
the present invention. As in the first embodiment, an endoscope
power supply system of the second embodiment includes an endoscope
2 and a housing apparatus 3. In the following, blocks in the
endoscope power supply system 1 will be explained. In FIG. 3,
blocks that are the same as those shown in FIG. 1 are specified by
the same reference symbols as those in FIG. 1, and explanations
thereof are omitted.
[0037] An insertion section 21 of the endoscope 2 of the second
embodiment includes a determination unit 214 instead of the ID
memory 213. The determination unit 214 includes an appropriate
voltage value memory 2141. The appropriate voltage value memory
2141 is, for example, a flash memory, and stores information
indicative of an appropriate voltage value (or a range thereof)
necessary to operate the endoscope 2. The determination un 214 is
connected to a power supply line 222a. In this configuration, the
determination unit 214 digitizes and takes in a voltage output from
a power supply unit 32 of the housing apparatus 3 and applied to
the endoscope 2, and compares a value of the taken-in voltage with
the appropriate voltage value stored in the appropriate voltage
value memory 2141. If a difference between the value of the
taken-in voltage and the appropriate voltage value stored in the
appropriate voltage value memory 2141 exceeds a predetermined
value, the determination unit 214 requests the housing apparatus 3
through the communication line 222c to output the appropriate
voltage.
[0038] The controller 33 is formed of, for example, FPGA (Field
Programmable Gate Array) and controls operations of the housing
apparatus 3. The controller 33 also carries out power management of
the endoscope 2 in accordance with a request from the determination
unit 214.
[0039] The power supply unit 32 is explained below. FIG. 4 is a
diagram showing a configuration relating to power output to the
endoscope 2 in the power supply unit 32 of the second embodiment.
The power supply unit 32 of the second embodiment also includes a
plurality of LDO regulators, which are power source units. In the
example shown in FIG. 4, the power supply unit 32 includes four LDO
regulators 421, 422, 423, and 424.
[0040] Each of the LDO regulators of this embodiment is a variable
voltage output LDO regulator, which outputs a variable voltage. The
LDO regulator 421 converts an input voltage to a voltage in a range
from V11 to V1n and outputs the converted voltage. A current output
from the LDO regulator 421 is a current in a range from I11 to I1n.
The LDO regulator 422 converts an input voltage to a voltage in a
range from V21 to V2n and outputs the converted voltage. A current
output from the LDO regulator 422 is a current in a range from I21
to I2n. The LDO regulator 423 converts an input voltage to a
voltage in a range from V31 to V3n and outputs the converted
voltage. A current output from the LDO regulator 423 is a current
in a range from I31 to I3n. The LDO regulator 424 converts an input
voltage to a voltage in a range from V41 to V4n and outputs the
converted voltage. A current output from the LDO regulator 424
current in a range from I41 to I4n. Voltage ranges from V11 to V1n,
from V21 to V2n, from V31 to V3n, and from V41 to V4n are different
from one another. However, parts of the ranges may overlap. Current
ranges from I11 to I1n, from 121 to I2n, from I31 to I3n, and from
I41 to I4n may be either different or the same.
[0041] In the second embodiment, as in the first embodiment, an
output stage of the LDO regulator 421 is connected to a switch
including two FETs, namely FET Tr11 and FET Tr12, which are
back-to-back connected. Similarly, an output stage of the LDO
regulator 422 is connected to two FETs, namely FET Tr21 and FET
Tr22, which are back-to-back connected. An output stage of the LDO
regulator 423 is connected to two FETs, namely FET Tr31 and FET
Tr32, which are back-to-back connected. An output stage of the LDO
regulator 424 is connected to two FETs, namely FET Tr41 and FET
Tr42, which are back-to-back connected.
[0042] Operations of the endoscope power supply system 1 of this
embodiment will be explained. For example, when the user turns on
the power source of the operation unit 34 of the housing apparatus
3, the operations of the endoscope power supply system 1 start.
When the housing apparatus 3 is powered on, the determination unit
214 of the endoscope 2 requests the controller 33 of the housing
apparatus 3 through the communication line 222c to output electric
power corresponding to the appropriate voltage value. The
controller 33 controls the switches so that the appropriate voltage
value in accordance with the request is output from the power
supply unit 32. For example, if the requested appropriate voltage
value falls within the voltage range of the LDO regulator 421, the
controller 33 applies a gate-on voltage to the gates of the FET
Tr11 and the FET Tr12. Furthermore, the controller 33 executes
setting to cause the LDO regulator 421 to output an output voltage
that is the requested appropriate voltage. For this purpose, the
controller 33 inputs, for example, an analog voltage indicative of
the appropriate voltage to the LDO regulator 421. As a result, the
voltage and the current generated by the LDO regulator 421 are
output to the endoscope 2 through the power supply line 222a. The
electronic element, for example, the imaging element 212, of the
endoscope 2 is actuated by the electric power.
[0043] In the example described above, one LDO regulator is
selected for one endoscope 2. However, the embodiment may be
configured so that two or more TOO regulators are selected for one
endoscope 2.
[0044] The imaging element 212 images an inside of the subject body
and generates an image signal concerning the subject body. The
image signal generated by the imaging element 212 is input to the
signal processor 31 of the housing apparatus 3 through the output
signal line 222b. The signal processor 31 executes signal
processing for the image signal. Thereafter, the controller 33
inputs to the monitor 35 an image generated as a result of the
signal processing of the signal processor 31, and causes the
monitor 35 to start displaying the image. Accordingly, the image
inside the subject body is displayed on the monitor 35.
[0045] During operations of the endoscope 2, the determination unit
214 digitizes and takes in a voltage output from a power supply
unit 32 of the housing apparatus 3 and applied to the endoscope 2,
and compares a value of the taken-in voltage with the appropriate
voltage value stored in the appropriate voltage value memory 2141.
if a difference between the value of the taken-in voltage and the
appropriate voltage value stored in the appropriate voltage value
memory 2141 exceeds a predetermined value, the determination unit
214 requests the housing apparatus 3 through the communication line
222c to output the appropriate voltage.
[0046] The controller 33 controls the switches so that the
appropriate voltage value in accordance with the request is output
from the power supply unit 32. For example, if the voltage applied
to the endoscope 2 is lower than the appropriate voltage value
because of an increase in resistance due to aging degradation of
the cable 22, the controller 33 executes controlling to increase
the voltage output from the power supply unit 32. For example, if
the difference between the voltage applied to the endoscope 2 and
the appropriate voltage value falls within a range of voltage that
can be generated by the LDO regulator 421, the controller 33 sets
the LDO regulator 421 to increase the output voltage by the
difference. On the other hand, if the difference between the
voltage applied to the endoscope 2 and the appropriate voltage
value does not fall within a range of voltage that can be generated
by the LDO regulator 421, the controller 33 controls the switches
to select another LDO regulator.
[0047] As described above, the second embodiment achieves the same
advantageous effects as those of the first embodiment. Furthermore,
in the second embodiment, the applied voltage is monitored in the
endoscope If the value of the applied voltage is not the
appropriate voltage value, the endoscope 2 requests the housing
apparatus 3 to output the appropriate voltage. As a result, even if
a voltage drop occurs due to aging degradation of the endoscope 2
or the like, the appropriate voltage can be applied to the
endoscope 2.
[0048] In the second embodiment, the applied voltage is monitored.
Instead, however, the embodiment may be configured so that both a
voltage and a current are detected to monitor whether or not the
electric power supplied to the endoscope 2 is appropriate electric
power.
[0049] Although the present invention has been described based on
the embodiments, the invention is not limited to these embodiments,
and various modifications or applications may be made without
departing from the spirit or scope of the general inventive concept
of the present invention.
[0050] For example, in the above embodiments, the endoscope 2 is a
type of endoscope that forms an image to observe an object with an
imaging element However, the "endoscope" of the embodiments is not
limited to such a configuration. The "endoscope" of the embodiments
may be of any type that contains an electronic element therein. For
example, an optical endoscope (optical viewing tube or fiber scope)
may be included in the "endoscope" of the present invention, if it
has a configuration in which a camera scope can be connected to an
eyepiece. Furthermore, the "endoscope" of the embodiments includes
both a soft endoscope and a hard endoscope. Moreover, the
electronic element is not limited to an imaging element.
[0051] In the embodiments described above, the housing apparatus 3
is a video processor. However, the housing apparatus 3 is not
limited to a video processor. For example, the housing apparatus 3
may be a light source apparatus that supplies illumination light to
the endoscope 2. The housing apparatus 3 may integrally include
both a video processor and a light source apparatus.
[0052] In the embodiments described above, the power supply unit is
an LDO regulator. However, the power supply unit is not limited to
an LDO regulator. For example, the power supply unit may be a DC-DC
converter. However, the LDO regulator can reduce a ripple noise in
comparison with the DC-DC converter.
[0053] Additional advantages and modifications will readily occur
to those skilled in the art. Therefore, the invention in its
broader aspects is not limited to the specific details and
representative embodiments shown and described herein Accordingly,
various modifications may be made without departing from the spirit
or scope of the general inventive concept as defined by the
appended claims and their equivalents.
* * * * *